The Senior Advisor was charging forward, and as John Brown's elbow struck back, even though John Brown wasn't particularly fast, the relative speed was incredibly high. Furthermore, John Brown's move was extremely swift, and the Senior Advisor had clearly seen John Brown's action, but it was too late to react.
However, the Senior Advisor was indeed a true master. Even at such a moment, he could still make the wisest choice. He violently leaned back, inhaled, and focused all his strength on his chest. Unable to dodge, he could only choose to take John Brown's hit head-on.
But John Brown's move turned out to be a feint, with the real fatal strike coming from below. His right foot spun, and his left foot swung horizontally.
All of the Senior Advisor's strength was concentrated in his chest, and his legs were moving forward entirely out of inertia. Even if he sensed the attack, he could only hastily react, channeling the strength from his chest down to his legs.